Polarized muon decay: Measurement of the polarization vector of the decay positrons

Details Polarized muon decay: Measurement of the polarization vector of the decay positrons Polarized muon decay: Measurement of the polarization vector of the decay positrons

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..570..366b&link_type=abstract

The fourteenth international spin physics symposium, SPIN2000. AIP Conference Proceedings, Volume 570, pp. 366-370 (2001).

Physics

Decays Of Muons, Polarization In Interactions And Scattering

Scientific paper

In the standard model (SM) of electroweak interactions the positron from the decay of polarized positive muons is mainly longitudinally polarized. The measurement of the two transverse polarization components, therefore, is a sensitive tool for contributions from additional, exotic, interactions. The energy dependence of the transverse polarization component PT1, which lies in the plane spanned by muon-spin and positron momentum, yields the low energy parameter ɛ and thus an improved model-independent value of the Fermi coupling constant. A non-zero value of the transverse component PT2, which is perpendicular to the above mentioned plane, would be the first observation of time reversal violation in a purely leptonic decay. The μPT experiment at the Paul Scherrer Institute determines the three polarization components simultaneously with the same apparatus by making use of three different reactions (spatial and temporal dependence of annihilation-in-flight with polarized electrons as well as muon decay asymmetry). The use of a stroboscopic method greatly reduces systematic errors. The measurement of the longitudinal polarization serves mainly as a test of the sensitivity of the apparatus, while the measurement of the two transverse components will improve the current experimental limits. The preliminary results are PT1=(7+/-13)×10-3, PT2=(19+/-13)×10-3. .

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